Cách sử dụng
The expression "puzzle over" means to try to figure out or solve a problem or mystery. You can use it when you are trying to understand something that is confusing or difficult. For example, if you are reading a book and there is a part that you don't understand, you can say "I'm puzzling over this chapter, I don't understand why the character did this." It is a way of saying that you are thinking deeply about something in order to understand it better.